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//===-- SystemZELFObjectWriter.cpp - SystemZ ELF writer -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/SystemZMCFixups.h"
#include "MCTargetDesc/SystemZMCTargetDesc.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>
#include <memory>
using namespace llvm;
namespace {
class SystemZELFObjectWriter : public MCELFObjectTargetWriter {
public:
SystemZELFObjectWriter(uint8_t OSABI);
~SystemZELFObjectWriter() override = default;
protected:
// Override MCELFObjectTargetWriter.
unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
const MCFixup &Fixup, bool IsPCRel) const override;
};
} // end anonymous namespace
SystemZELFObjectWriter::SystemZELFObjectWriter(uint8_t OSABI)
: MCELFObjectTargetWriter(/*Is64Bit_=*/true, OSABI, ELF::EM_S390,
/*HasRelocationAddend_=*/true) {}
// Return the relocation type for an absolute value of MCFixupKind Kind.
static unsigned getAbsoluteReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_1:
case SystemZ::FK_390_U8Imm:
case SystemZ::FK_390_S8Imm:
return ELF::R_390_8;
case SystemZ::FK_390_U12Imm:
return ELF::R_390_12;
case FK_Data_2:
case SystemZ::FK_390_U16Imm:
case SystemZ::FK_390_S16Imm:
return ELF::R_390_16;
case SystemZ::FK_390_S20Imm:
return ELF::R_390_20;
case FK_Data_4:
case SystemZ::FK_390_U32Imm:
case SystemZ::FK_390_S32Imm:
return ELF::R_390_32;
case FK_Data_8:
return ELF::R_390_64;
}
Ctx.reportError(Loc, "Unsupported absolute address");
return 0;
}
// Return the relocation type for a PC-relative value of MCFixupKind Kind.
static unsigned getPCRelReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_2:
case SystemZ::FK_390_U16Imm:
case SystemZ::FK_390_S16Imm:
return ELF::R_390_PC16;
case FK_Data_4:
case SystemZ::FK_390_U32Imm:
case SystemZ::FK_390_S32Imm:
return ELF::R_390_PC32;
case FK_Data_8:
return ELF::R_390_PC64;
case SystemZ::FK_390_PC12DBL:
return ELF::R_390_PC12DBL;
case SystemZ::FK_390_PC16DBL:
return ELF::R_390_PC16DBL;
case SystemZ::FK_390_PC24DBL:
return ELF::R_390_PC24DBL;
case SystemZ::FK_390_PC32DBL:
return ELF::R_390_PC32DBL;
}
Ctx.reportError(Loc, "Unsupported PC-relative address");
return 0;
}
// Return the R_390_TLS_LE* relocation type for MCFixupKind Kind.
static unsigned getTLSLEReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_4: return ELF::R_390_TLS_LE32;
case FK_Data_8: return ELF::R_390_TLS_LE64;
}
Ctx.reportError(Loc, "Unsupported thread-local address (local-exec)");
return 0;
}
// Return the R_390_TLS_LDO* relocation type for MCFixupKind Kind.
static unsigned getTLSLDOReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_4: return ELF::R_390_TLS_LDO32;
case FK_Data_8: return ELF::R_390_TLS_LDO64;
}
Ctx.reportError(Loc, "Unsupported thread-local address (local-dynamic)");
return 0;
}
// Return the R_390_TLS_LDM* relocation type for MCFixupKind Kind.
static unsigned getTLSLDMReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_4: return ELF::R_390_TLS_LDM32;
case FK_Data_8: return ELF::R_390_TLS_LDM64;
case SystemZ::FK_390_TLS_CALL: return ELF::R_390_TLS_LDCALL;
}
Ctx.reportError(Loc, "Unsupported thread-local address (local-dynamic)");
return 0;
}
// Return the R_390_TLS_GD* relocation type for MCFixupKind Kind.
static unsigned getTLSGDReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case FK_Data_4: return ELF::R_390_TLS_GD32;
case FK_Data_8: return ELF::R_390_TLS_GD64;
case SystemZ::FK_390_TLS_CALL: return ELF::R_390_TLS_GDCALL;
}
Ctx.reportError(Loc, "Unsupported thread-local address (general-dynamic)");
return 0;
}
// Return the PLT relocation counterpart of MCFixupKind Kind.
static unsigned getPLTReloc(MCContext &Ctx, SMLoc Loc, unsigned Kind) {
switch (Kind) {
case SystemZ::FK_390_PC12DBL: return ELF::R_390_PLT12DBL;
case SystemZ::FK_390_PC16DBL: return ELF::R_390_PLT16DBL;
case SystemZ::FK_390_PC24DBL: return ELF::R_390_PLT24DBL;
case SystemZ::FK_390_PC32DBL: return ELF::R_390_PLT32DBL;
}
Ctx.reportError(Loc, "Unsupported PC-relative PLT address");
return 0;
}
unsigned SystemZELFObjectWriter::getRelocType(MCContext &Ctx,
const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
SMLoc Loc = Fixup.getLoc();
unsigned Kind = Fixup.getKind();
if (Kind >= FirstLiteralRelocationKind)
return Kind - FirstLiteralRelocationKind;
MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
switch (Modifier) {
case MCSymbolRefExpr::VK_None:
if (IsPCRel)
return getPCRelReloc(Ctx, Loc, Kind);
return getAbsoluteReloc(Ctx, Loc, Kind);
case MCSymbolRefExpr::VK_NTPOFF:
assert(!IsPCRel && "NTPOFF shouldn't be PC-relative");
return getTLSLEReloc(Ctx, Loc, Kind);
case MCSymbolRefExpr::VK_INDNTPOFF:
if (IsPCRel && Kind == SystemZ::FK_390_PC32DBL)
return ELF::R_390_TLS_IEENT;
Ctx.reportError(Loc, "Only PC-relative INDNTPOFF accesses are supported for now");
return 0;
case MCSymbolRefExpr::VK_DTPOFF:
assert(!IsPCRel && "DTPOFF shouldn't be PC-relative");
return getTLSLDOReloc(Ctx, Loc, Kind);
case MCSymbolRefExpr::VK_TLSLDM:
assert(!IsPCRel && "TLSLDM shouldn't be PC-relative");
return getTLSLDMReloc(Ctx, Loc, Kind);
case MCSymbolRefExpr::VK_TLSGD:
assert(!IsPCRel && "TLSGD shouldn't be PC-relative");
return getTLSGDReloc(Ctx, Loc, Kind);
case MCSymbolRefExpr::VK_GOT:
if (IsPCRel && Kind == SystemZ::FK_390_PC32DBL)
return ELF::R_390_GOTENT;
Ctx.reportError(Loc, "Only PC-relative GOT accesses are supported for now");
return 0;
case MCSymbolRefExpr::VK_PLT:
assert(IsPCRel && "@PLT shouldn't be PC-relative");
return getPLTReloc(Ctx, Loc, Kind);
default:
llvm_unreachable("Modifier not supported");
}
}
std::unique_ptr<MCObjectTargetWriter>
llvm::createSystemZELFObjectWriter(uint8_t OSABI) {
return std::make_unique<SystemZELFObjectWriter>(OSABI);
}
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